Buffet: Resort Casual (shorts, t-shirts, skorts and jeans)
Dining Rooms: Formal nights you need dress clothes; suits or tuxedo's for men, ladies need evening wear. There are some great photo opportunities on these nights with many different back drops to choose from.
Dining Room on the other nights: Ladies can wear pant suits, dresses, dress slacks, blouses, and or skirts. Men-dress pants, or Docker type pants, and sports shirts.
Does this help?